Drying it off with a towel will stop most of it. You don't need as strong a H3PO4 solution as ospho. Go to Home Depot and and get a product called "Must For Rust". It is a mild phosphoric acid solution that should be mostly used as a rust protectant. Comes in a squirt bottle, spray it on and wipe the excess off. A similar product (internet only) is Picklex 20, costs much more and I consider it no better than Must For Rust. On your manifold it won't make much difference, but I don't like using acid on cast--it can get in the pores and cause lifting of the paint later. However, I have done it without problems, but I don't use it on cast any more. The main way to prevent rust is to get the thing dry and keep it that way.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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