Easy, take your plant into your yard, lie them down, attatch a hose sprayer to your garden hose....Set it to Shower and blast your plants under the leaves, then spin your plant and blast, spin the pot and blast...Just make sure branches are supported or the weight of the water might snap them..
I been doing it this way for decades, no chemicals, clean your tent and put them back...
I grow outdoors and I do this for plants deep in flower too
if you are unable to lie the pot down put a garbage bag over the soil to prevent saturation, stake the branches up and spray, i use gloves in this situation else you get sticky hands