How can i clean my heater core?

Skyetone

Kinda crabby latley
Location
East side
my toy has a clogged heater core. it gets kinda hot, the tubes going in get really hot. but when I blow air through the core from the outside it pulls all the heat off. I am vertually sure it's clogged. radiator shops say that they rod radiators clean. But a heater core you cant. But I was thinkin git is probably just calcium deposits or something in the core, so why couldn't i use lime away or something? pull the core, fill it as best as possible with lime away, let it soak, the flush really well? if there was reminants, would it eat motor things if it went through the system?
any other ideas?
 
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