How to clean out the worms and stuff?

[Rogue951]

I have a CPR overflow and there's a lot of tubeworms or whatever inside the overflow. How do I clean them out??
I'm done with the overflow as I have upgraded to a tank with a built in so what's a good way to get rid of it?

I know laundry detergent dissolves flesh over time. but I'm betting the plastic will absorb some of it which is not good.
so what's my alternative?