Any suggestions for treatments before and post pump out especially when passenger used it both ways one tie. Was able to just pump it through but want to treat/clean tank
What do you mean by "passenger used it both ways?" If you mean a passenger committed what to you is the sin of depositing solid waste as well as urine, marine toilets are designed to handle both...and urine can stink just as much if no treatment is added. Solid waste is at least 75% water and therefore dissolves in water quickly. Just make sure to add water to the bowl ahead of solids (use a cup from the sink!)
There's certainly no need to clean and "treat" the tank just because some solid waste went into it...you'd have to sterlize it to do any good anyway. And tank treatments aren't products used to "recover" a "soiled" tank. Tank treatments used correctly are added to tanks that are in use, to prevent odor and break down solids and toilet paper.
If "was just able to pump it through" means your toilet had a hard time flushing it, your toilet pump may be in serious need of rebuilding or replacement. And, you prob'ly need to instruct your guests in the RIGHT way to use the toilet (after you learn how?)...which would include adding water to the bowl ahead of solids and using limited amounts of quick-dissolve TP.
I agree with Steve's recommendation to use Odorlos
Odorlos Holding Tank Treatment --available from RV supply stores for a LOT less than marine stores charge. However, I recommend liquid instead of powder because liquids don't have to dissolve, so all of it gets into the tank . Add through the toilet, NOT down the pumpout. Most importantly, read and FOLLOW the directions for use! (You might try that too, Steve...adding more often works a lot better than double doses.)
You're obviously new to marine toilet and tank use and maintenance, and so--unlike a lot of people--you've wisely chosen to err on the side of caution instead finding yourself having to ask for help to heal self-inflicted wounds that could easily have been prevented. Read the your toilet's instructions for use... and you MIGHT want to check out the link in my signature...it's a "marine toilets and holding tanks 101" manual that should help you learn to relax and enjoy having toilet facilities aboard instead of panicking if they're used.