I agree with Ray Butterworth that throwing the brushes and rollers away is the easiest solution with the least impact on your local sewage system. Especially if you used special water resistant paints or those with special covering properties (to cover water stains), this may be your only solution.
If you insist on cleaning the tools and you only used "normal" wall paint, the key is to remove as much paint as possible without water. Some ways to do that:
- scrape the paint off with a spatula or piece of cardboard
- put the rollers into an old paper or plastic bag and squeeze as much paint as possible out with your hands
- wipe the brushes and rollers on old newspapers or paper towels
If you have any lumps of leftover paint, it's always best to let them dry and dispose of them in the garbage.
What's left of the paint after this first cleaning should be dissolved in water in several steps:
- Rinse the implements very thoroughly in a little amount of water. It will quickly look like the water is saturated, but that impression is wrong. Really push and work the tools in that water to dissolve as much paint as possible. This small amount of water should be either left to dry or disposed at a local recycling facility like regular paint (never pour paint into a sewer system).
- You can repeat cleaning the implements with old newspaper or paper towels to get as much paint as possible out.
- If necessary, repeat step 1 and pour the dirty water into the same container, then dispose of it as in step 1.
- Rinse the tools in a big amount of fresh water. At this stage most of the paint should have come out already. Regular wall paint should be so diluted now that the rinsing water can be disposed via the local sewer system.
If you think that the water after step 4 still has too much paint in it, you can let the bucket stand undisturbed for several days. Slowly the paint should form a layer of sludge at the bottom with clean water at the top. You can drain the clean water and dispose of the sludge at a local recycling facility or let it dry and throw it in the garbage.