The wall behind a stove gets wiped with whatever is nearest, and that cloth then goes in with the dish towels. It comes out feeling slightly slick, and after a few rounds it stops wetting out properly and starts to hold a smell of its own. Nothing was done wrong. The cloth is carrying three different things at once, and only one of them behaves like ordinary kitchen grease. With the stove running longer at this time of year, and a run of bigger meals ahead, that one cloth does more work than anything else in the drawer.
What the Wall Behind a Stove Gathers
Frying and roasting throw a fine mist off the pan. Droplets a few thousandths of a millimeter across rise with the hot air, drift sideways, and land on the nearest cool vertical surface, which is the wall behind the stove. Each landing is tiny and invisible. Over a season of cooking they build into a continuous film across the whole panel.
That film does not stay oil for long. Vegetable oils are triglycerides with double bonds along their fatty acid chains, and those bonds react with oxygen in the air. The reaction links molecules to each other into longer and longer chains. The oil thickens, then goes tacky, then sets into something much closer to a soft varnish.
Soot joins it. Any flame or very hot pan produces fine carbon particles, and carbon sticks readily to a partly oxidized oil film. That is why the mark on a wall reads brown rather than clear, and why it comes away on a cloth as a dark smear instead of a simple greasy one.
A cloth taken to that wall therefore takes on three things in one pass. Fresh oil, which behaves like oil. Partly hardened film, which behaves like a resin. And carbon, which is an insoluble pigment that only leaves if the wash water physically carries it out of the weave and down the drain.
Why Oil Behaves Differently in Cloth
On a tiled wall the film sits on top of a smooth surface. In cloth it does not. Oil wets fiber readily, spreads along the outside of every filament, and wicks into the spaces inside a spun yarn. The same oxidation that was happening on the wall then carries on inside the yarn, where no amount of wiping can reach it.
Oxidation speeds up with temperature. A rise of about ten degrees Celsius roughly doubles the rate. A cloth that goes through a hot dryer, or that sits folded while it is still warm, ages its oil load much faster than one left to cool first. That is the usual reason a cloth that seemed fine turns stiff and yellow over a few weeks.
Once the oil has cross linked it is no longer a liquid that detergent can lift. Detergent works by surrounding a droplet of oil with surfactant molecules and carrying it off into the water. A polymerized film gives the surfactant nothing to surround. It is a solid stuck to the fiber, and it has to be broken down rather than carried away.
The smell follows the same chemistry. Oxidizing fats split into small volatile aldehydes and ketones, and those are what a cloth starts to announce once it holds old oil. The cloth can be free of anything you would call food and still carry an odor, because the odor is coming out of the fiber rather than off the surface.
Cotton Terry, Flat Weave and Microfiber
Cotton is hydrophilic, which means water competes well with oil for the fiber surface. In a hot alkaline wash the water wins a good share of that competition, so cotton gives oil up better than its bulk suggests. Terry has a lot of surface area in its loops, so it takes on plenty, but it also releases plenty.
Split filament polyester microfiber is the opposite case. It is oleophilic, it has an enormous surface area, and the channels between its split filaments are narrower than the clusters of surfactant molecules that would have to get in there to do the work. It lifts a wall film beautifully and then holds onto it.
A flat woven cotton or linen cloth has the least to hide anything in. Less surface area means it lifts less per pass, so you wipe more, but what it does take on sits where water can reach it. It also shows what it is holding, which is useful, because a backsplash cloth that looks clean and feels slick is lying to you.
So the cloth that performs best against the wall is the hardest one to recover afterward, and the cloth that recovers easily asks for more passes. That trade is the real decision, and it is worth making deliberately rather than by whatever came to hand.
Washing a Grease Loaded Cloth
Temperature is doing mechanical work, not just chemical work. Most cooking fats are fully fluid well below the temperature of a warm wash, and a fluid film can be surrounded and carried off. A cold wash leaves a lot of it as a semi solid that the water simply flows past, which is why the cloth comes out feeling slippery.
Alkalinity matters as much. A detergent with real alkalinity converts some of the free fatty acids in an aged film into soap, and soap rinses. That reaction is the main reason an ordinary powder often outperforms a mild liquid on these cloths, and the reason a gentle cycle with a delicate product gets nowhere.
Oil also needs somewhere to go. In a crowded drum the oil that comes off one cloth simply finds another, because there is not enough water to hold it in suspension until the drain. These cloths do better washed as a small group with plenty of water around them and an extra rinse at the end.
And they should not travel with absorbent items you care about. Transferred oil coats the loops on a bath towel, and a coated loop stops wicking and starts beading. One grease loaded cloth in a towel load can take the absorbency out of the whole load, and that change is not easy to reverse.
The Second Problem, What the Cleaner Leaves
A degreasing spray works by loading the surface with surfactant. Most of it comes away on the cloth, and a good share of it stays in the cloth through a light wash. That is the slick feel when the cloth dries, and the strange low foaming behavior next time it goes in with everything else.
Polish type wall sprays are worse, because they are meant to leave something behind. Silicone and wax deposits are water repelling by design. A cloth carrying them stops absorbing and starts pushing liquid around the wall, so you wipe harder and spread the film further than you lift it.
Fabric softener belongs in the same category. It works by depositing a positively charged waxy layer on fiber, which is excellent for a sweater and the single worst thing for a working cloth. The layer repels water, traps oil underneath it, and makes every later wash less effective than the one before.
So the plain routine is a hot wash, a full dose of a detergent with some alkalinity, no softener, an extra rinse and a complete dry. When a cloth still will not wet out after that, it is finished as a cloth. Nothing restores a fiber surface that has been coated and polished over and over.
Cooking Season Air in Vancouver
Vancouver runs cool and wet through the back half of the year, which changes how fast a wall film builds. Windows stay shut, the air from a pan stays in the room instead of moving out of it, and more of that fine mist finds a surface to land on. The same amount of cooking leaves more behind indoors than it would in open air.
Cool rooms also give that mist a bigger temperature difference to meet. A warm oily droplet landing on a cold wall sticks where it lands rather than drifting on, so the film sets in place faster and the cloth that wipes it comes away carrying more in a single pass.
WaveMAX Vancouver is at 8109 NE Vancouver Mall Drive, Suite F and G, easy to reach from Vancouver and the surrounding area. A machine you are not sharing with the rest of the week’s wash is the straightforward way to run kitchen cloths hot and on their own, with enough water around them that the oil leaves instead of moving sideways.
Keep the Kitchen Cloths Separate
Kitchen cloths are a small load with a large demand: hot water, a real dose of detergent, room to move and a thorough rinse. Running them in a machine of their own keeps the oil they are carrying out of the towels and bedding, and gives them the water volume that getting an aged film out actually requires.
The machines at our self-service laundry on Northeast Vancouver Mall Drive let you give a handful of grease loaded cloths a hot cycle on their own, with the extra rinse that matters most for cloths carrying both oil and the residue of whatever was sprayed on the wall.
Our machines and the store are cleaned daily.
Nou wash-dry-fold service covers the everyday laundry.
For general guidance, The American Cleaning Institute publishes a stain removal guide that is a useful cross-check.
The short version
A backsplash cloth holds fresh oil, oil that has already oxidized into a resin, fine carbon and whatever cleaner was used on the wall. Only the fresh oil washes out easily. Hot water, a detergent with some alkalinity, plenty of room in the drum and no softener give you the best of it. Wash these cloths apart from towels, because transferred oil coats loops and stops them wicking.
WaveMAX Vancouver is at 8109 NE Vancouver Mall Drive, Suite F and G, easy to reach from Vancouver and the surrounding area. If you have a load that will not fit at home, call us at 360-433-9864.