I've used Zymol for the past eight years, on numerous vehicles.
Results are excellent, but you get what you pay for with wax as with everything else in life.
The 'cleaner wax' sold in Halfords is a good alternative to Autoglym, providing a better shine, but has less ability to remove tar spots as it has much less solvent content (if any at all). You still have the problems of the white residue afterwards though. The SUV autowash is a good shampoo, but can be a little too strong - use at half recommended strength to prolong the life of the wax coat.
The rest of the Zymol range is completely different - requiring a strict regime of washing, cleaning and then waxing initially. See
www.zymol.co.uk for information. Take a look at the links to their forum and the 'just polished' section. All these Zymol products are completely solvent and silicone free, using natural alternatives to provide a stable product for application.
The cleaner takes off all old polishes, ingrained dirt, and some light oxidation, but will not remove heavy oxidation (ie faded paint) or bird etchings (for these Meguiars have more effective products, albeit some of the range seems to duplicate other products, for instance they have two scratch removal products, and three paint cleaners).
Follow this immediately with one of a wide range of waxes, some specific to certain car paint finishes. These start at £35 per tub, and go up to £1500 per tub !. Each tub should last 20-25 applications.
The higher the price the more carnauba wax present, ranging from about 35% in the cheaper waxes (Creme / Carbon) to 60% in Vintage. Some waxes can be applied with sponge applicators, others have to be applied by hand (by taking a small amount inhands , rubbing them together to melt the wax and then massaging your paintwork directly with your hands). An interesting experience but you don't half get some strange looks from the neighbours, and its an absolute bugger in the cooler six months of the British climate (even in a heated garage)
I started with a Carbon starter kit, approx £70 at the time, and this lasted for two years (waxing every month religiously, using the cleaner every 6 months), and washing every week (needed to buy an extra bottle of shampoo in this time). Since then I have progressed and now use a variety of waxes dependent on the outside temperature (in summer it is warm enough for Vintage or Atlantique wax application, but in the winter I have to resort to a wax with less carnauba content.)
Sounds like a nightmare I know but depends on how much effort you want to put in, and what your standards are. It takes me an hour per week to wash and dry the car, I clean every six months (2 hours) and wash every month (1.5 hrs).
I tried Meguiars on another vehicle recently, the paint cleaner was very good (£8) but the wax is not a patch on Zymol's. I suppose you can mix and match to a certain extent, but I will not be moving from Zymol for the forseeable future - this is the Maybach of car waxes.
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Anyway, did/does your car have these marks and did they polish out?
