Musky smell inside - leather is clean, carpets are clean, just purchased it and cannot get this smell to dissipate. It's like it comes through the air vents

If it's a musky sweat smell feel your floor under dash for dampness. Possibly heater core.

You need to have a pressure test done. Any shop can do it or you can get the kit and do it yourself.

Is your floor wet damp carpet? Does the smell kinda smell sweet or like maple syrup? If so your heater core is leaking. Your heater core is up under ur dash inside the van onthe firewall

Could be some type of fluid leak, possibly coolant entering
the fan housing inside under the dash

Or a water leak from sun roof onto carpet

there are several types of sprays to clean interriors. one is for carpets and fabric other type is for plastic other is for leather or vynil.

first of all you need to clean interriors by sweeping it with vacuum cleaner and with water and natural soap. do not use lots of water since you will need to dry it later.

after cleaning interrior you need to proper liquid to clean related surface and wiping it with a soft quality cloth.

in general fabric surfaces like top lining and seats and carpets require two pcs of sprays(multi purpose interrior cleaner). if you seats are leather covered you need leather contidioneer. after cleaning fabric and leather. use plastic cleaner in pressureized spray cans. after wiping off all left cleaning agents, clean windows with only alcohol with a microfiber cloth.

this will take normally 1 to 2 hours. use gloves.

Its on the firewall, more to the pass. side. Look for the two coolant hoses going to the firewall, the tube will be in the visinity below and to one side a few inches. Let me know how you mad out!

Is it on the seat/carpet? If so you might have to remove it and pressure wash it. if you can clean it off and remove smell with carpet/upholstery cleaners or put some coffee grounds and let it soak up for a day or so then vaccum it up

You may have a low charge of freon, most likely about 10 ounces, as far as the musty smell that is mold from the inside of the AC air box, they make various chemical tratments to cure this issue, but once the smell is there it can be diofficult to kill the mold that causes it.

This usually means that the drain holes are clogged, which causes water to collect where it shouldn't. In a short time, it becomes stagnant and smelly. You'll need to remove the cover from the a/c and clean out the drain holes and probably also the pan underneath it. Don't use anything sharp or metal though.