Reddit mentions of 303 (30618) Fabric Guard, Upholstery Protector, Water and Stain Repellent, 16 fl. oz.

How To: interior cleaning and protecting

1. Inspect the interior for any problem spots. Any spilled drinks? Caked on mud anywhere?
   
2. Take note of the door jambs (picture 3). If your car is parked outside 24/7 like mine, you will have a ton of dirt build up in here.
   
3. Remove everything from the interior, including floor mats.
   
4. Give the mats a good shake (picture 6).
   
5. Wipe away what you can with a carpet brush (picture 8).
   
6. Vacuum up the rest (picture 10)
   
7. If need be, use a carpet cleaner (picture 11)
   
8. Let it sit and dab up when ready. When drying carpets and upholstery, you want to twist and blot up any liquid. Rubbing back and forth doesn’t do much of anything except grind in dirt (picture 13)
   
9. Using various vacuum attachments, suck up what you can (pictures 15, 16).
   
10. Protect the dash and inside panels with a UV blocking product (pictures 17, 18, 19, 20, 21). Doing so will prevent fading/cracking of the interior surfaces.
    
11. Clean up the door jambs with a microfiber and cleaner. I am using ONR diluted to QD strength. Depending on how dirty your car is, you may have to step it up to APC (pictures 22-25).
    
12. Clean up the inside part of the trim (picture 26)
    
13. To get behind the door hinges, I like to ‘needle’ the microfiber behind it. This way it picks up any dirt as it is pulled through (picture 28).
    
14. Continue to spot clean any further areas (picture 29).
    
15. To protect the carpets, use a water repelling product like 303 Fabric Guard (pictures 31-33).
    
16. Use one of those reachy-wand things to get the back window if it is far back. It’s a total PITA, but just be patient (pictures 34-36). Use a VERY LIGHT spritz of cleaner on the microfiber; otherwise you’ll make more work for yourself by creating streaks.
    
17. The interior of the windshield is also a bit of a pain. Do not spray window cleaner on the glass. Once again, spray it on the microfiber. Flip your hand upside down, and work in the opposite direction of which you worked on the exterior. Buff off as you did the exterior. To get the driver’s side, place your left knee on the passenger seat, and your left hand on the driver’s seat. Keeping your right hand upside down, repeat as you did the passenger side. Buff off and check for streaks (pictures 37-40).
    
18. Clean the rest of the interior windows on the doors.
    
19. To protect the inside door jambs, I like to use a spray sealant. Keeps them pretty clean, and I usually only have to use a light product like ONR to clean them (pictures 41, 42)
    
    Note I did not have any reason to use my steam cleaner this time. Here is my review of the steam cleaner I use.
    
    
    Products used:
    
    Peak microfibers from OTC places - I don't use anything 'nice' on the interior. Simple all purpose microfibers will suffice, unless cleaning the glass. Follow my guide from the exterior for those tips
    
    Vacuum - anything will be fine. There is no such thing as a 'car vacuum' or 'detailing vacuum'. Use one that has a variety of attachments to get in the nooks and is strong enough to suck up dirt. http://www.homedepot.com/p/RIDGID-14-Gal-Professional-Wet-Dry-Vac-WD1450/100081216 This is the one I have, though it was not featured in the guide as my dad was using it at the time.
    
    Adam's Total Interior Detailer
    
    Adam's Carpet & Upholstery Cleaner
    
    Carpet Brush Anything stiff bristled will do
    
    303 Fabric Guard
    
    Lug Nut brush size 10
    
    The window wand thing can be found OTC
    
    NanoSkin NanoShock