How many drops to 1 tablespoon lotion?

We'd recommend mixing 1 to 12 drops with the same amount of lotion you would usually use for each area of the body, so for each of your limbs and the front and back of your torso. The two products should be mixed thoroughly between the hands before being applied on the skin.

Does it come off when you shower or does it last?

Depending on how long you keep the application on (instructions say 1-4 hours for light to darker result), the tan will last several days. Showering throughout the week will lighten the tan over time but it's definitely not immediate. I've been using this for 6+ months and absolutely love the results. The application mitt is a must if you purchase the spray vs. the mousse version.

Can I put clothes on right after application?

Yes ! thats the magic of the solution being clear is that it can transfer on to clothe. I put in on right before bed and my sheets are fine.

Do you have to rinse off? I have had sometbat you gave to rinse off after 1 to 4 hours for it to develop

Yes, you apply for 1-4 hours, depending on how dark you want the results to be, then shower it off. Over the next day, the tan definitely darkens. I'm a regular user of this product and always get great results.