Use vinegar to remove calcium deposits. Mix vinegar with a small amount of water and scrub at the deposits with a rag or paper towel. For better results, soak a rag with vinegar and leave it on the deposit overnight.
It was fun to tow the model and weigh it down to its lines, but I don't know enough to recognize if there is anything to be learned from its bow wave or wake.
Different manufacturers have different promo programs, but basically, a promo buyer gets a new boat at near dealer cost in exchange for agreeing to bring it to a certain number of tournaments or shows per season.
I used to simply drag my old TY off the back of the trailer onto soft grass. Then rig it and use the mast as a lever to heel it almost onto its gunwales so I could remove the keel. Reverse the process for installing the keel again.