This is from my own experience.
Wash
- Any car shampoo works here
- A B&Q grout sponge or cheap MF mitt from poundstrecher
- A couple of £1 B&Q buckets or similiar ones from any store
- Spending £10 on a drying towel isn't budget is it, but i can't think of a cheaper alternative that won't inflict marring
Clay
- Megs kit for semi-cheap
- Clean Your Car have a good double clay pack for around £10, make your own lube
- Make your own lube from the shampoo and use blu-tak for clay
Protect
- Any carnuba paste wax from a supermarket would do wouldn't it so long as you apply regularly
- Best bang for buck is Colly 476s applied with the misted red side of a german app pad, a little goes a long way.
- AG EGP, put it in a spray bottle which makes using the right amount much easier so it's easy to remove as well, apply with the red side of the german app pad
- groundnut oil or ag bumper care for black plastics applied with any old sponge or rag
- AG bumper care works pretty well on tires as well i've found, still got plenty in my 325ml bottle after 20+ applications, buffs to nice factory finish or shiny if you leave on.
Polish
- By hand it's got to be 325/500ml of AG SRP using the white side of that german app pad, done this myself with excellent results, albeit sore arms
- By machine, £25 silverline r/o with a menz polish/finishing pad using the SRP again, or megs #80/83 if you want to spend more, tested this recently with excellent results as well.
Interior
- Not exactly budget but Poorboy's Natural Look Dressing, smells nice, easy to apply for factory finish or shiny, a little goes a long way if you use it with a spray head.
- Any other good non-silicone stuff?
Other
- Spray bottles, MF work cloths, and APC all cheap and easy to find in pound shops and supermarkets
- Wheel brushes are pretty cheap, wilko do one for £2
- If you don't want to spend for a megs slide lock brush pick up a pack of paint brushes for a £1 in poundstrecher and wrap in the metal bit with duct tape to prevent scratching.
Don't know if this was any help, just thought i'd try and pitch in.