No ratio. Fill the container to cover with water. Add enough Dawn to make a soapy bubble bath. Probably 1/2 gallon water and 1 tsp Dawn.
SecondedDon't waste your time. Dawn soaking is way overrated. It's messy and you have to dry off all the parts. Then you have polish them anyway.
Get a good chrome polish, apply it to the part, let it dry for a minute or two and hand polish with a cotton cloth. Get a toothbrush for getting the polish out of crevices.
Plain water will do the same thing .Dawn soaks are overrated........on some things.....like blackened rust.....or things already in very good shape. It's very helpful though on "lightly" rusted items....typically brown and orange rust.
At the black rust stage (oxidized bare steel, chrome gone) it takes an acid to remove that black oxide. Not a bad idea to do the soak to remove all contaminants from the item prior
to your chrome polishing. A typical chrome drum hoop I let soak for 1-4 hours. Then rinse....dry....and polish.
I recall a heavily rusted Gretsch Giant cymbal stand I had. 90% of it was covered in that brown-orange rust. I figured it was a basket case worth at most $5-$10.
I tossed it in a typical 1-100 to 1-500 Dawn Solution for 5 days. I came by every few hours and agitated the solution and the stand. It often helps to give it a light
wiping with a Brillo pad, 0000 steel wool, etc to remove that loose top layer of oxidation. Since the stand started out at nearly worthless, anything is an improvement.
It got cleaner every day. I was amazed. At the end of 5 days nearly all the brown and orange rust was gone. The chrome wasn't bright but it did shine a bit.
The stand looked decent and presentable. Sold it for $75 on Reverb. There's no way chrome polishing that on day 1 would have done anywhere near the same imo.
My view is soaking is the least aggressive form of cleaning you can do. Why not do that first?
Be careful your soak solution doesn't get too dirty or it could let the particles reattach to your item. I always rinse down a stand after the soak with water, and then with a Windex spray bottle.
The basic pH ammonia helps to neutralize any low pH (acidic) solution still on the stand.
Almost any solution of Dawn will work. The concentration affects the time needed. I've never tried 1-1. I typically use 1-50 to 1-500. Usually no more than a few hours
to a day is needed for most stands in good condition. When the item is not getting any better.....you're done. When stands get that cloudy or milky mildew look to them I don't find the
Dawn very helpful without scrubbing or polishing to remove that.
White vinegar is a good chrome cleaner (NOT nickel though). You can spice up the Dawn soak with some vinegar.
If I had to do that Giant stand again - I'd probably add 1/8 to 1/2 cup vinegar in the "tub" for faster rust removal.
Plain water will do the same thing .