I ordered a set of Avons today
Good move...
I recently had a problem with really fine rust in my sons Z650, some of it was making it through the filters, both in the tank and the inline filter, I used two magnets, I stuck one on the outside of the tank in the lowest point of the rear of the tank and moved the tank around until I was happy that all the rust was stuck to the inside of the tank where the magnet was, I then removed the magnet and used my telescopic magnet to reach into the tank and remove the fine rust, I was amazed just how much came out, this was after completely cleaning the tank and putting about 30 nuts inside and some fuel and rolling it around to scrape everything off.....
PS, the magnet I used on the outside of the tank was from out of an old hard drive, they are rare earth magnets and very strong....