2010 RX 350 how do I unclog the ac drain

high pressure blast with a "pinner" needle blast...you may have one in your toolbox, but they've been outlawed for the consumer....so go to your local shop, tell them you need a blast of air out the exit tube, if they are mechanics they will find it immediately...you may want to change the environmental filter too, while you're over there~

your A/C charge may be low, a differential between condensor and evaporator is a delicate balance, if you have insufficient charge may cause condensation and dripping~