My suggestion is to take an unusable icon with you on a campout, wrap it in some old cloth or newspaper and burn it in the campfire. Distribute the ashes somewhere well off the trail once the fire has died down. We go over sanctified places with the manual push-sweeper before vacuuming to pick up any holy particles. The sweeper is then emptied into the burn pot. We can then vacuum the area with a conventional machine used for the rest of the parish.
Alcohol is the best solvent around for cleaning.
Lipstick and incense tar are the hardest to clean, but alcohol gets them both. They leave a film behind that summons dust even as far as the narthex. The best metal polish available is Nevr-Dull. It won't wear off your platings, since it works without forceful polishing. The best soap for cleaning the altar area and impliments is olive soap.