buy around 2 gallons of vinegar, and fill a small tub with it OUTSIDE. Place a piece of tubing on one end of the rad. Submerge the rad in the vinegar(This cleans off any shit on the outside, as well as corrodes away the copper corrosion)then suck on the tube to get a siphon going into a new bucket, once it has pulled the whole container through the rad do it again(repeat as much as deemed neccessary). Once this is done flush it with de ionized water(dont use tap water) and rinse it with regular tap water(The fins and such)
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