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    1. · Super Moderator
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      This is what I am talking about - It IS aggressive...a steel wire brush on an aluminum bore...I use it carefully and softly by hand to break up the pipe residue...and then follow with a fine grit buffing wheel. My wire brush is the 1/2 inch diameter size which is much smaller than the hole- easier to control.

      Armour Line RP77261 Tube Cleaning Brush, 1/2 in, Pack of 1
      https://www.amazon.com/dp/B0754X9ZHP/ref=cm_sw_em_r_mt_dp_58Y5G1Z71D18AKJD5484

      regarding brake cleaner...its your call, but:
      1. most of it will dry or evaporate,
      2. It's a tiny amount of solvent in 2 gallons of coolant, and
      3. Since I pressure test (and drain) with distilled water before final fill with 50/50, much of it will flush out.
       
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      Discussion Starter · #56 ·
      This is what I am talking about - It IS aggressive...a steel wire brush on an aluminum bore...I use it carefully and softly by hand to break up the pipe residue...and then follow with a fine grit buffing wheel. My wire brush is the 1/2 inch diameter size which is much smaller than the hole- easier to control.

      Armour Line RP77261 Tube Cleaning Brush, 1/2 in, Pack of 1
      https://www.amazon.com/dp/B0754X9ZHP/ref=cm_sw_em_r_mt_dp_58Y5G1Z71D18AKJD5484

      regarding brake cleaner...its your call, but:
      1. most of it will dry or evaporate,
      2. It's a tiny amount of solvent in 2 gallons of coolant, and
      3. Since I pressure test (and drain) with distilled water before final fill with 50/50, much of it will flush out.
      I think I have one of those brushes I used to clean my battery connectors.
      I bought a dremel yesterday with a extra fine finishing abrasive buffer (320 gr - 512E).
       
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