Looking for water dish liners

Does anyone know of any liners for 8" water dishes or liners in general for large water dishes?

Currently I use metal dog food bowls for my boas. I chose them due to their weight in hopes the snakes would not easily flip them. In that respect they work great. However, they are a bear to clean.

I am considering using cheap metal pie pans to fit inside my current dishes. I am looking for ideas that will work that are as cost efficient as possible.

I want to avoid cleaning water dishes completely.

Scrubbing water dishes is just part of husbandry.

I do not know of a satisfactory AND hygienically sound method of using liners.

If you want to never scrub water dishes again, you're going to have to look into disposables. But disposables have all the cons. They tip, they're expensive, they can be flimsy...etc.

My best advice to anyone new in the hobby is to buy two sets (at least) of dishes for every enclosure. Fill and swap out, and let the dirty ones soak in bleach water long enough to make them a breeze to clean. Or, get a cheapie dishwasher off Craigslist and devote that to water dishes only.

a dishwasher isn't taking the crud off these metal pans. I use Brillo pads.

Is it just hard water crud?

We have ground up rocks for water here! It's so hard that everything! has or gets build on on it. My snake bowls require a presoak to get that crap off.