I know it all depends on the surface contaminate but ideally, you want something detergent-based that brakes the oils down, sometimes a solvent can concentrate the oils to a thin surface film as it evaporates.I'd customise some pieces of sponge / foam to fit the depth, then give a couple of wipe outs with thinners or panel wipe (depending what the sponge medium could stand)
Just went to the kitchen sink ... the spongey scourer things look idea, cheap and easy to get.
Hope you donate to the forum, must be saving your business a fortune
cillit bangI know it all depends on the surface contaminate but ideally, you want something detergent-based that brakes the oils down, sometimes a solvent can concentrate the oils to a thin surface film as it evaporates.
Well worth a watch.