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It is very often a result of the placement of the battery....
but that is not an absolute given where you live and what they use on roads in the winter, etc..
Your question about the wire brush brings up the possibility that you are not in a position to do this repair safely... but we can discuss that more...
You have not posted the after vacuum pics.. but a forward looking steel cone brush, a flat side steel brush, and possible as cup steel wire brush which would fit a 90 degree angle grinder .. if you can fit it into these areas would be helpful...
You need to describe your past metal working and auto experience... and what tools you have available.... this will be the worst job you have ever done on a car.. part because of all the angles and tight spots...and because of the sealants which they have put in for sound deadening... a true mess... you could do a custom perfect paint job on this car for less hassle than this job.. if that is what you are getting at wanting to know more details...
If you do not do the investigative steps in order to help me understand the situation.. I will not be able to help you. I will not participate if I think a safe fix is not possible within your tools and helper's abilities...
and I will warn you ahead of time... there are whippersnappers on this forum who do not understand that a welded metal seam is less strong than the metal was before being subjected to that heat ( and potentially oxidation if not properly TIG welded )...
Therefor an appreciation of real steel rivets interspersed with plug welds, and safe practices to keep from setting the car on fire will be needed.
I can send you to references .... and you will need to study them and ask questions...
This is almost a structural repair on your car.... or it really may be ... depending on your investigation of what you have left to work from...
Greg
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