Never apply chemicals to Raypath sponges
Never use or place Raypath sponges on a hot surface.
Never use Raypath sponges on a rough surface that could tear them apart (e.g. a brick wall).
Never allow dirty Raypath sponges to dry. Either wash them immediately or let them soak in a bucket with water until they are washed.
You can wash dirty Raypath sponges two ways :
When the Raypath sponges are clean, let them air dry. Never put them in a dryer.