Removing heavy deposits and corrosion
When you have corrosion or more stubborn dirt, it can be difficult to remove; the end result will be dependant on how severe it is.
It Is best to do this during the washing process. Start by removing any loose dirt from the vehicle, leave the surface wet and spray an acid based wheel cleaner onto the tip of the exhaust or where the corrosion is.
Leave for up to 3 minutes, but not longer than the manufacturers recommended application time.Use a 00 – 0-grade wire wool( note 0 grade is more aggressive) tear off a small amount and rub only over the corroded area.
Tear off a small amount and rub only over the corroded area. You need to continue rubbing the surface until you have removed the corrosion. Unfortunately, this is not easy to do, and will most likely take several repeated attempts.The finished results will partly depend upon the choice of acid cleaner you use.
We find using Autoglym wheel cleaner (professional) is one of the best products, thanks to its strong formulation. It is very effective at this task, and although you will probably not be able to remove all of the corrosion, but you should be able to make a significant difference.
Once You have completed this process, rinse off and re-clean using your usual shampoo, or something with a neutral or a slightly alkaline ph, as this will help neutralise the acid from the cleaner. Dry the surfaces thoroughly, and then polish as normal.
The above method can be really effective, but it can also be quite high risk. However as it is the only way we know of removing corrosion, It is important to stress that you should always do a small test area as damage can easily occur, so proceed with caution.