19-07-2020, 12:01 PM
I'm not qualified to comment but it gets a mention on page 21 here: http://www.saltmine.org.uk/pdfs/rrue.pdf
Personally I tend to go for old-fashioned, laborious mechanical means to remove external rust e.g. wire brushes though I've been know to use warm citric acid inside the odd block or head to dislodge stuff I can't get at with a pokey tool.
Personally I tend to go for old-fashioned, laborious mechanical means to remove external rust e.g. wire brushes though I've been know to use warm citric acid inside the odd block or head to dislodge stuff I can't get at with a pokey tool.