Paint prep?

[dlb511]

Hi. I am getting ready to paint the deck and topsides of my 20' MA. I will probably spray on Awlgrip maybe Sterling. Can't decide which way to go. First however, I need to do a lot of sanding and prep. What can I use to wipe down the existing finish to remove the wax? Both Awlgrip and Sterling sell their proprietary chemical for the purpose for $40 to $50 a gallon, and of course say it must be used. There must be a less expensive way to do this, lacquer thinner? acetone? Either one is far less costly. Would they or some other alternative be effective. I am supposed to clean off the wax before I even start to sand, so, any suggestions? I have pulled all of the hardware so filling and sanding is the next step and I want to get started. TIA