(This will also work on beauty blender dupes)
You can either branch out and buy the actual beauty blender cleaner though I don't think. It's necessary as there's cheaper things to use
• baby shampoo
• a bar of soap
• ordianry shampoo
Method
Make sure your beauty blender is totally covered in soap etc and start rubbing in circular motions under hot water
How to know its clean
Every time after rubbing for about two minutes squeeze the sponge to see if any excess makeup comes out continue with this process until no makeup comes out
Clean beauty blender/sponge