You have to dispose of different accessories from the area of painting supplies in different ways. Here is a list of what belongs where:
Hazardous waste collection point: liquid paint, paint thinner.
Residual waste: hardened paint, wallpaper paste, brushes, rollers, paint tubs, foil
Recycling bin / yellow sack: empty paint containers
If you have leftover paint after painting that you have no further use for and want to save yourself a trip to the hazardous waste collection point, simply allow it to air dry and, when it has hardened, throw it in the residual waste. Disposing of it down the sink or toilet is not an option under any circumstances.
In the case of paint thinners, turpentine and special cleaners, there is no way around the hazardous waste collection point. The same applies to cloths that have come into contact with them during cleaning.