Engine; vac interior and clean leather etc; wash, clay, polish
wax or seal.
That the best ordering or should exterior come before interior?

Do it that way. Think about using electricity to do the interior with the water all wet. You want to minimize that and since you are polishing... you might want to MOVE it or use a waterless wash like ONR.

the order doesn't really matter. i usually do exterior first :dunno

just do engine before the exterior.

i think the right order is interior, engine, wheels, exterior

and yea get some ONR to get rid of dust from compounding/polishing

OK, when i say exterior I mean completely not just wash.
So electrocution is a moot point.
I figure it's best to wash and dry and not waste a lot of time prior to claying, polishing and or waxing.

How is ONR waterless? You have to use water to mix, don't you?

ONR I have no personally used, but I only hear great things about it. I have used DP 4in1, which is similar, and I like it a lot. It is REALLY different than a normal wash, so it takes some time to get used to.

You need water to mix, but usually 3 gallons of water gets a whole car done. No rinsing and spraying so hardly any water actually makes it to the ground. No risk of electrocution. :)

I do wheels/tires/wheel wells, then engine, then full wash, clay, dry. Then take a break, and decide whether I want to do interior next or start polishing...usually polishing hehe.

ONR I have no personally used, but I only hear great things about it. I have used DP 4in1, which is similar, and I like it a lot. It is REALLY different than a normal wash, so it takes some time to get used to.

You need water to mix, but usually 3 gallons of water gets a whole car done. No rinsing and spraying so hardly any water actually makes it to the ground. No risk of electrocution.
Optimum No Rinse (ONR):
Is an almost waterless wash (i.e. its rinse less); formulated with surfactants to keep dirt in suspension, avoiding surface contact, it also provides surface lubrication, thereby avoiding surface marring.

Use a Monster Fluffy micro fibre towel for washing. Take one towel and wet it with ONR mixed as per directions. Wring it out and make a single pass per clean side of the towel. You can get 4-8 passes, with the towel folded in quarters. Each pass is then done with a perfectly clean towel surface and you're never rinsing any dirt out and releasing it in to your wash or rinse water. You can do the whole car with 2-4 towels. Apply no pressure to the towel. I just glide it over the surface and only make one pass in one direction with a clean surface.

If you use the two bucket method (one fitted with a grit guard) which highly recommended with this type of product, the wash solution will stay clean enough to be reusable as a pre-soak solution or for cleaning wheel surfaces. ONR is formulated to ensure that dirt particles won’t mix with the solution but fall to the bottom of the bucket.

There in no need to rinse afterwards with ONR, but if you feel you must, please ensure that the water goes to a sewer and not a storm drain; either way the lubricating polymers in the No Rinse do a better job of protecting the finish than conventional car soap. Use in tandem with Optimum Spray Wax for a ‘just waxed’ look

If you use the two bucket method (one fitted with a grit guard) the wash solution will stay clean enough to be reusable. ONR is formulated to ensure that dirt particles won’t mix with the solution but fall to the bottom of the bucket.

Products- URL’s removed
Monster Fluffy towel – detailers paradise
Optimum No Rinse (ONR) – optimum car care
(See also Quick Easy Wash (QEW)