Hey knowledgeable people, i have some strange scratched blotches on the bonnet of my silver Celica. Looks like someone has scrubbed it with a scouring pad in several places...
Unless I'm very much mistaken, the Farecla range is supposed to be used with a machine polisher. I expect that doing it by hand didn't break down the polish enough to be completely effective. It's possible that it filled in the scratches enough for them to not be noticeable but this then got washed away the next time you cleaned it.
To avoid scratching the car whilst washing it you really need to use the two-bucket method and a lambswool mitt, followed by a waffle-weave drying towel.
Pretty much anything else is going to drag the dirt across the surface of the paint while you're washing or drying and create more scratches.
To get rid of the scratches you already have, get a decent hand-polish (T-cut, Menzerna S203, Meguiars Step 1, Autoglym Super Resin Polish) and give it a really good rub-down. Then use a glaze with filler like Meguiars Step 2 or Autoglym Extra Gloss Protection. This will fill in any of the scratches you haven't removed with the polish. Finally put on a decent wax like Meguiars Step 3 to protect the paint for the future.
That's going to be the cheapest/easiest solution. If that doesn't fix it you're going to have to look at machine polishing, either buying the kit yourself or paying someone to do it for you.