Dried cement on paintwork

[Jonh1969]

aaaaaarrrrrrrrrrggggghhhh!

I have a drop of dried cement on the bonnet. It's rock hard! About the size of a 20p piece, and relatively flat.

Anyone have any ideas how to go about removing it?

I've read about soaking it in a mix of 50% vinegar and 50% water and then just picking away at it

Would welcome any other thoughts.

Thanks

Jon

[Nemo78]

We had this one parents car - they literally had it on the A-Pillar of drivers door.

Like yourself read everywhere including detailing world...but eventually ended up doing nothing.

Just used pressure washer every now and then when cleaning / washing the car and eventually all came off without me having to scrape etc and no damage to paintwork or anything.

Good luck with it

[mazerati]

You could try making a little dam arround it with plasticine or the like and letting it soak in your solution,
but cement sets due to a chemical reaction not by drying, hence it will set underwater, so have doubts.
Builders remove it with something called Brick Acid, but wouldn't recommend that on your paint work.
So have to go with Nemo78 on this and let time and weather do its stuff.
Good luck , if you do manage let us all know the solution.

[fronty]

I feel for you! I had this on the bonnet of my old Passat when my garage was being built, just a few small light spots. But they mysteriously disappeared after a day or two so I just thought they might have washed off in the rain. However when I was cleaning the car a few days later I noticed the bonnet was really badly scratched, especially in the area where the spots had been - it looked like someone had tried rubbing them off and then scratched the paintwork. I challenged the builder and they denied it, then got a bit shirty that I was accusing them in the first place. TBH I didn't want to upset them as my garage was only half built at the time and I didn't want them walking off the job, so I let it drop. But when it came to sell the car I had to get it sorted and ended up getting the whole bonnet resprayed. :-(

[wardienet]

You could take it in to a professional detailer and see if they can get it off and if needs be republish it for you after.


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[gitlygit]

Go to a Tool hire centre. Some of them keep a special concrete remover than just turns it to a bubbly dust. They use it on cement mixers etc. I am sure if you ask nicely they will squirt some on your cement.

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[FortyPlus]

Go to a Tool hire centre. Some of them keep a special concrete remover than just turns it to a bubbly dust. They use it on cement mixers etc. I am sure if you ask nicely they will squirt some on your cement.

Not so sure that is a good idea
Most likely that is a strong Sulphuric / Hydrochloric Acid or similar. Almost certain to damage all the paintwork it contacts. A very high risk approach IMHO. Or maybe i am missing a joke...

[vinylspin]

Perhaps this will help Remove cement from a car - YouTube