Just doing some maintenance on my Bayliner with a merc 5.7. I had to remove a couple of things and looking at the bolts it was a question do I just go out and buy some new ones or reuse them. In a discussion with my son a few days ago the question of ultrasonic cleaners came up, I decided to go on amazon and look at what the deal was. So all caution to the wind I ordered a 3 litre ultratrasonic cleaner 142.00 dollars.So today I decided to try it out on a couple of badly rusted bolts, so on utube there is a guy Steves small engine repair, believe he is around Duncan he claims that lysol toilet bowl cleaner is the best for this job. So ok the I will try it, I am blown away with the result,with 12 minutes with this unit the bolts are like they came out of the factory. I would like to hear from any of you if you have used one of these and your results