the mold part i"m very familular with. half vinagar half water, bleach will lighten the moldy spot but vinager kills the mold spores.

do a net search for myo (make your own) toilet cleaner, oven cleaner and pick a recipe/ method that you have the ingredients on hand for.

Here is the cleaning without chemicals method for your oven;

And here are other Hometalker ideas:

Vinegar for all 3! Easiest Google search in the world, plus all the fantastic remedies posted by Hometalkers. Just click on "browse projects" then click on the "cleaning" Tab. Here are a few links to get you started! You will now be purchasing vinegar or cleaning vinegar by the gallon. Way cheap at Costco, Sam's Club, restaurant supply houses, roughly $2 per gallon.

Goggle homemade cleaning recipes. Tons of info out there. Vinegar and baking soda are used very often.

The best and cheapest home remedies for cleaning are baking soda and vinegar. You can put both in your warm water and clean away.