A concept: sieve with a handle that goes over top of it to hang over your bathtub faucet so you don't have to hold your bubble bar filled sieve under the water.
Review: Lush Cocktail Sieve Bath Bomb – Oh My Lush.com
Sieve for weekly cleaning of resin bath, 25 pcs | Straumann Group - Straumann United Kingdom & Ireland
Wenko - Pack of 2 Stainless Steel Bath & Shower Hair Sieve - 3902020100 at Victorian Plumbing UK