method rengoering foer, glanskning and polishing of skoera aemnen saasom stone and maalade surfaces

摘要

In a method of cleaning, buffing or polishing a fragile material, such as building facades of stone, painted surfaces or window glass, a jet of air containing particles of vegetable origin is directed on to the fragile material. The particles are in powdered or granular form and may include particles of corn stalks which have been crushed and reduced to powder.