Concrete

[jabez]

How do you get dried concrete off the hood of your car? Found some on my truck's hood. Thank god it wasn't on the Vettes.

[TOGWT]

Concrete Spots:

Calcified water spots on paint and glass, water and concrete spots are pretty much the same chemically; calcium carbonate, with the concrete being cross-linked with water

Removal
• Apply 1:1 ratio water with distilled White Vinegar solution, and using a spray bottle, spray that mixture on the spots and let them "soak." Then rinse with water and repeat as necessary.
• If the ambient temperature water/vinegar mix does not work, warm (100-120 degrees) 100% distilled White Vinegar, saturate a clean kitchen sponge with pure vinegar and hold the sponge over the concrete spots for a few minutes
• If the above do not remove them try equal parts distilled water, isopropyl alcohol and distilled white vinegar. The acid in the vinegar will help etch and dissolve the concrete.
• Rinse the area thoroughly with water after the vinegar and then reapply wax or sealant to that area.

a) To remove concrete that has set use a Decontamination / Neutralization system
a safe alkaline wash and neutralizing system the ABC wash apparently loosens the bond with the clear coat, after using the wash simply lift off any concrete with a plastic razor, for smaller specks use detailers clay, any subsequent etching will require an abrasive to level the paint surface, and then reapply wax or sealant to that area.

b) Back-Set by Romix is an acid alternative with no fumes or odours, molecularly breaks down the ionic bond in Portland cement, completely dissolving and releasing the hardened cement from any surface it is adhered to. Chemically speaking, Back-Set converts the positive ions in the hardened matrix into negative ions, which dissolves the cement into mud that can be rinsed away. Because it works chemically, rather than mechanically, Back-Set may be used to remove cured concrete, mortar, grout, and stucco from virtually any surface without harm. Always apply Back-Set to a dry surface area

An extract from “Automotive Detailing, Inside & Out”, a knowledge base for the perfectionist © TOGWT ™ Ltd Copyright 2002-2009, all rights reserved. This book enables direct access to five decades of detailing knowledge and experience