If you could give me your advice to hopefully put my mind at ease.

At the carwash I sprayed a fairly powerful water gun into the wheel well and sprayed it right at the suspension (I was scared at the time the mud was damaging my luxury vehicle).

Could I have done any damage with a water gun used for car cleaning?

Please help, Nick!

 

Chill Nick. It's not likely that you hurt anything using a car wash pressure wand in the wheel wells or under the car. Folks do it all the time with no ill effects. The mud underneath the car will have no lasting effect but it's a good practice to avoid it if possible.