For the top of my refrigerator I bought a length of heavy plastic meant for a floor, but narrow like a runner. It is easy to take down and wash off in the sink. I don't know why that couldn't be used for the shelves too.

the plastic sheet will cut down maintenance as in cleaning the shelves...

Firm plastic (1/8") cut into shelf sizes should work. A thin wall around the edges will minimize spills from dripping down.

Amazon has plastic shelving.

https://www.hometalk.com/25567481/under-20-dollar-tree-fridge-makeover?expand_all_questions=1#!

Under $20 Dollar Tree Fridge Makeover

Jan...You can just cut shelf padding to the proper size.

You could just use some padded foam placemats.