I have an 03 21i Wakeboard boat with TAPS. Boatyards have told me they can't install the Mercruiser flush kit I bought. Apart from using the fake-a-lake, is there a way to reverse flush in order to get any junk out that is in the cooling system? Or do we just assume any junk (since I don't have a strainer, which they said they couldn't fit) eventually gets forced out.