When cleaning your painting tools, start by spreading the brushes and rollers on an absorbent surface - newspaper, kitchen paper or fabric remnants are good candidates - to remove excess paint. How you proceed with cleaning depends on the type of paint or varnish used.
If you used a water-based paint, you only need clear water to clean your brushes and rollers. Rinse the respective painting tool under running water until no more paint runs out. If no traces of paint remain when you squeeze it out on a paper towel, everything is spotlessly clean. If the cloth discolours, you have to rinse again. Proceed in the same way with paint rollers.
If the paint on the tool contains solvents, you will need a brush cleaner, thinner or turpentine substitute. Pour the liquid into a bowl and move the brush or paint roller back and forth until no more paint comes off. It usually takes several passes to clean thoroughly. Rinse with clear water afterwards.
Wallpaper paste is generally water-soluble, so you can clean paste rollers, brushes, the mixing tool and the bucket simply with warm water.