Rear springs clacking on acceleration or de-exceleration.

Just bought a 2015 Tacoma.
Drive it out of the dealership and notice a clacking noise coming from the rear upon stepping on the gas and upon braking.
Drive back to dealer.
Up on the lift and 3 mechanics plus my salesman working on it.
Decision was undercoating applied the day before was causing the spring leafs to stick and then release causing the clack.
They cleaned in between the leafs with brake cleaner spray and wiped with rags and said it will stop when undercoating dries and dirt and road grime eventually get in between leafs.
Drove home in the rain and have driven it a little around town (110 miles on it)
Has anybody experienced the same or have any comments?
Long time P/U owner, first time Tacoma. Love it other than that.
Thanks