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RonC · 01-07-2018, 08:31 AM

Lye or draino will eat it out. You may need to do it twice if really bad. Don't leave in for more than 20 min. Wear protective eyewear and clothing. back flush out well with water/short air blasts. Will be like new inside

01-07-2018, 08:31 AM	#5
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: radiator visitors Lye or draino will eat it out. You may need to do it twice if really bad. Don't leave in for more than 20 min. Wear protective eyewear and clothing. back flush out well with water/short air blasts. Will be like new inside