Mate you should buy some primochill Blue Tubing, looks better then the tygon tubing and it has some kind of anti corrosive which is built into the tubing which stops gunk etc, So you can just use Distilled water which is great... to clean out your rads use 1:9 Distilled with vinegar .. Flush it 3-4 times with distilled:vinegar then flush it 3 more times with just distilled, be sure to shake the hell out of the radiator to get some of the hard gunk which can build up..