1. thats ok, my friends pajero never got washed in a span of 5 years its only car wash is when a heavy rain pours, but try to wax more often, if you plan on DIY then try to get more durable waxes if you can't wax that often, try Dupont Carnuaba Wax and Collinite, they really last a long time. You could check the net and the forums if you are interested, if im not mistaken some people here in the forum sells them, i know someone that sells collinite and i could refer you, but im also on the look out for someone selling Dupont since i ran out of it.
2. thats maam for you hahaha,
4. Have you noticed if the stains gradually get worse everytime you get long drives and suddenly it rains? I've read somewhere about what you call paint failures. One instance is when the engine gets really really hot coupled with a blaring sun and suddenly it rains cooling down the hood rapidly. Paint Failure can damage either clear coat only, color coat only, or both due to the rapid change in temperature, but these instances are very very rare. I've had an overheat accident one time driving to pagudpud the hood was so hot that time and when we were just about to pour water it suddenly rained really hard. My boyfriend thought it would be better to cover the car again and let the hood suffer rather than have the hot engine cool down rapidly and probably get more damage in the engine and radiator, so we covered the engine and waited for the rain to die down before we poured water. When we got to our destination my hood was a bit dull, what we did was buff it off when we got back to manila and it did the job pretty well.
That would depend on what you plan to achieve. At this point we're still not sure if step 1 can indeed totally remove or at least improve those stains on your car. So IMO, if you plan on fixing those stains on your car, Step 1 2 and 3 would make more sense since its like a paint rejuvenation process. Also in getting Step 1 2 and 3 the whole car would benefit from the added shine and gloss. Usually people buy Step 1 2 and 3 first and then buy the clay later on.
But if upon washing your car and while still wet and while it still has some soapy water try to run your hand across the paint panels, if you feel sand like or dust like particles stuck on your paint after washing with a wash mitt then you might be better off with Clay + Step 1 + Sachet Wax, especially if the other parts of your paint aside from those that has stains are still in good condition. If the other paint panels are still in good condition and has very little scratches or swirls, or if you don't consider removing swirls and light scratches immediately then this would also be the way to go.
I would recommend you get a paste wax version of Step 3 for the following reasons, Step 3 paste version creates a thicker layer of wax over your paint due to its chemical density in the process giving you more protection. Paste waxes in general are not easily absorbed by applicators as compared to liquid waxes getting more wax on the paint than inside the applicator. Paste waxes also require a lot less quantity to cover a whole car, and usually with paste waxes a little goes a long way. In my experience i've had more applications from paste waxes as compared to liquid waxes, i know the liquid is also cheaper but for me 1 paste wax is already about enough to compare with 1 and a half to 2 liquid wax bottles saving you more in the long run.