All washing up liquid contains :
Salt
Degreaser
Bleach
so, not very kind to automotive paint.
As for the Exhaust it isnt illegal according to the MoT Handbook
Quote:
Body condition
This part of the examination applies to all vehicles.
4. Examine the body work for excessive corrosion or damage resulting in sharp edges which are likely to cause injury,
4. A sharp edge or projection, caused by corrosion or damage, which renders the vehicle dangerous to other road users, including pedestrians
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