you get wrapped up and the wraps draw out toxins and water leading to weight loss. Apparantly very good. Can anyone remember the technical name for it? Or had experiences with it? Thanks!
Body wrap is the tecnical name

Any water loss is totally temporary, it's just sweat. Unless you are after something to slim down a particular area (usually arms or thighs) for a particular event, it's probably not worth focussing on the cetimetres lost, they will return pretty quickly, not quite as fast as when you drink the next glass of water, but it's not a long term solution. For the dramatic centimetre reducing option, you get wrapped up in long elastic bandages like a mummy - I'm not aware of any place offering that style in Australia (it's quite common in America, there probably is somewhere doing it in Australia, just it's not the usual body wrap)
The usualy body wrap is you get covered in gunk and wrapped in plastic to cook for a while. You will sweat wrapped in plastic, so there are some toxins/water coming out. What the gunk is depends on what you are after - seaweed will do a detox, makes you go to the bathroom a lot, makes you lethargic afterwards, but feel good the next day IF you drink lots of water. Clays & muds will remineralise you, and draw out some toxins if it dries out, though they usually don't dry out, because you are sweating, active clays will be quite invigorating, other clays/muds, depends on the type. The gunk can be alowe vera for a sunburn wrap, some hydrating cream to de-winterise your skin (bannanas are good, but any hydrating cream can work)
Herbal Linen wraps another kind, again not common in AUstralia, because they are a pain to do, they're very traditional European spa, sheets (linens) are soaked in a very hot herbal tea solution and then you are wrapped in the sheets (no gunk applied, it's all what the sheets are soaked in that is doing the work), makes you sweat, as you cool down you absorb the tea solution and reabsorb some of your sweat so the skin becomes super hydrated.
Paraffin body wraps are another option - you get covered in hot paraffin wax, if forms a seal, you sweat, toxins come out, sweat comes out. You can have gunk applied between the skin and the paraffin that will be absorbed after you stop sweating.
And the latest high tech options are things like FIR wraps - Far Infra Red flexible panels are velcroed around you and switched on, results are the same as being in a FIR detox box/sauna.
I could go on, there are more, but this basically covers it.
They're not too difficult to do, and can be fun. Get a blanket covered with a plastic sheet (drop sheets from the hardware store are good) with a very wide large piece of muslin over the plastic, all large enough to wrap around you securely, get some green clay make up a mud, slather yourself in the mud, lie in the middle of the blanket/plastic/muslin, throw one side over, then flick the other side over, (or easier, get someone else to tuck you in) and relax. 20min later go have a shower. You can use aloe vera instead of the clay, or a hot oil mix with essential oils or whatever. What you're paying for at the day spa is someone to apply the gunk and wrap you securely, dim the lights, adjust the volume of the soothing music, maybe give you a face/scalp massage (if your head is not wrapped), unwrap you, remove the gunk, then usually you add a massage......... Some spas will have the vichy shower so you don't even have to stand up to wash the gunk off, or they will use hot towels to remove the gunk. OK, maybe the spa option is sounding better than wrap yourself.....