What is the best method to remove rust in gas tank?
I have a 30 yr old Honda cm400 and I want to clean the tank out and remove any rust deposits to avoid anything getting into my carbs & engine. My local Honda dealer referred me to a local welding business that would clean it for around $80. But, after watching a few youtube videos, I realized you can clean the tank out cheaply using some type of gravel or washers/bolts. Can I effectively clean the tank out using gravel (aquarium gravel) or washers? If so, how would i rinse the tank out (water, gas,..)? Also, I saw something about evapo-rust. Would using this be better? I want my tank to stay clean and rust-free as long as possible. Is it necassary to seal the tank and, if so, how do i go about doing it? If anyone can give me some suggestions, it would be greatly appreciated. And, the biggest question: would it be better to just pay the 80 and have a professional do it or is the job a simple one and the 80 a rip-off?