Soap scum on silicone molds

Any tips on getting soap scum and residue off silicone molds? I got some used molds and even after scrubbing with hot soap and water, there is scummy residue around the pattern on the bottom.
I really don't want to take a toothbrush to 26 separate molds.

 

Tea tree oil?

Spray CLR on them and rinse after 5-10 minutes?

 

I can try the CLR, thanks.

 

Some of my silicone moulds also get soap scum in the details that I can not remove. Please tell me what CLR is.

 

Here’s a link to the product:

https://clrbrands.com/en-US/Products/CLR-Household/CLR-Calcium-Lime-Rust-Remover

 

Thank you, SoapySuds!

 

I usually soak my moulds with very diluted warm lye, that usually shifts any residual grease after unmoulding.

 

Lye works too. Like unclogging a drain pipe

 

I ended up using clr. It worked ok, got all the sticky gunk off the pattern. I did use a toothbrush though, just to make sure. Next time, I'll try lye.

 

I use one part white vinegar to one part dawn dishwashing liquid. Spray on with a spray bottle, let sit for about 10 min then wipe and rinse clean.

 

Hot water and Dawn dish soap and a veggie brush. Cuts the greasy film and keeps everything squeaky clean!

 

Tried that, didn't work. Its more then just greasy film, I think its hard water deposits or soap scum.mixed with oil.
Its dang near impossible to remove, vinegar doesn't touch it either.

 

Any way to get the smell of Nag Champa out of my silicone molds....?

 

For my part, I dont have a dishwasher....