It sounds like this Lexus wasn't well maintained at all. If that is going to continue, then fillers aren't very useful since they won't last very long on a car that is being taken to a brush car wash. The beauty of actually removing the swirls is that the results will last forever, or at least until new swirls are created. Using good protectants and washing frequently will help prevent new swirls and will yield long lasting results. The bottom line is, without a PC, you are never going to be able to remove the swirls, only hide them. And without taking proper care of the car, hiding them won't last long at all. I would say that your best off deciding whether or not maintaining your car is important to you. If it is, invest around 250 for the PC, pads and abrasive polish and do the job right. If its not worth the time and money to do that, just leave the car the way it is since you will probably never get satisfactory results anyway. Just my .02