Fores should always maintain porous, softness and uniformity. After a period of time, it will stick to the pores to block the pores after a period of time.
1. Wash cluster phosphates of clay and pigments.
2. Dissolt aluminum syndrome with hydrochloric acid, sulfuric acid, etc.
3. 1000L water temperature plus 2KG non-ion surface active solvents and 4kg triv phosphoric acid naste 100kg felt at 40-50 degrees and was washed 10-20min each time.
4. Formula for felt solvents.