The key rule
Test in an inconspicuous place. Use a minimal amount, wait through reaction and drying, then inspect colour, sheen and texture.
Step-by-step process
- Identify the surface, soil and manufacturer limits.
- Prepare ventilation, gloves and separate tools.
- Spot-test and use the smallest effective amount.
- Remove residue, dry and assess before repeating.
Limitations
Unknown substances, strong fumes, health symptoms, electrical hazards, extensive mould or biological contamination require stopping and seeking appropriate help.