Surface contamination

[DW81]

Hi there fellow detailing enthusiasts, have a bit of an issue I would like some advice on.
OK I think one of the neighbours had done some stone grinding works recently and as a result I could feel the contamination on the cars paintwork. I not long ago polished and coated the car with bilt hamber wax and I can only assume the contamination is effecting its effects.
I normally use bilt hamber auto foam and pH shampoo for my normal wash procedure. P&S beadmaker as my go to detailing spray to finish off.
Can I simply use some sort of contamination shampoo/foam to sort this out?
Don't really want to go the whole nine yards and start clay mitting the car again and possibly machine polishing it.
Any recommendations and advice from those of you that have had this issue would be much appreciated
Cheers Dan

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[NevMan]

Could be worth trying BH Korrosol or Surfex (maybe the latter) as they can get contaminants off without any/much contact…maybe a derailing brush in conjunction. Or you could use the fine clay mitt or cloth that won’t strip the coating…not sure on this one as may do