Does anyone know the meaning of "No Soliciting"

Dude, It's easy.

Look through the peephole to make sure it ain't friends or family.

Then open the door, naked.

Works every time.

Even better, answer the door naked, with a box of condoms, and ask them if they are interested in coming in since they want to interrupt.

They can't file a complaint. You have NO SOLICITING posted in plain sight.