Hi Carol! What kind of metal are you cleaning? A little warm vinegar and 0000 grit steel wool will clean brass nicely and make it look brand new!
Try this: https://www.hometalk.com/31532342/how-to-clean-your-oven-with-baking-soda-vinegar
Wipe first with soapy water then spray with warm white vinegar to dampen. Then sprinkle with baking soda. Rinse with a sponge, add baking soda as needed to scrub area. Rinse well with warm water. Dry with a soft cloth.
I use this method to clean old paint and varnish from furniture hardware. Remove the hardware and put it in an old pot on the stove. Add a tablespoon on baking soda and simmer for 30 minutes and all the paint and dirt just wipes off.
I have been doing the same on door handles and knobs. Works like a charm and no scrubbing, and no chemical fumes.
Hi Carol, hope these give you some guidance for cleaning with vinegar and baking soda, hope it helps you