Alternative to Hammerite ??
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Stuart Noble
saying something like:
Use dilute phosphoric acid, which is all Kurust is, to treat the rusty
areas with, first.
Not exactly off the shelf though
Milk parlour descaler, available by the gallon, is 30% phosphoric acid,
afair.
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