Persil
Persil is probably my favourite brand of detergent here in the UK - good all round performance, and relatively cheaper then the P&G counterparts. I've actually found that Persil doesn't affect absorbency of towels at all - P&G detergents are oodled with softeners and do affect absorbency of towels I've found. With towels washed in Persil, I find time and time again that towels are still dry even after use. I've also found all Lever powders and tablets rinse out extremely well. Louis was watching my washer on a whites wash the other night on my webcam. I was using Surf (Unilever's other flagship product in the UK), with suds halfway up the window in the mainwash. Suds lock etc in the spin after the wash. By rinse 2 (of 4) the rinse water was clear!!!
Anyway my opinions of all the Unilever Persil products I have/used:
Persil Bio powder:
Good all round detergent. Great on whites, and has a nice fresh but subtle smell. Rinses out great.
Persil Non Bio powder:
Again, a good all round detergent, but not so good on whites and other stains due to lack of enzymes. Also higher chance of colours fading, due to the increased amount of bleach and brightening agents to make up for the lack of enzymes. Again rinses out well.
Persil Colour powder:
My favourite detergent for clothes. Great smelling, and also good at cleaning. Basically the same as Persil Bio but without optical brighteners or bleach so keeps colours good. Rinses out very well, but unlike Persil Non Bio and Bio, it does leave behind quite a strong, floral, but pleasant fragrance.
Persil Non Bio tabs:
Same as Persil Non Bio powder, but in tablet form. However suds up a fair bit (up to where suds can come halfway up the window), but all suds disappear by rinse 2. Always create suds locks in the spin after the wash, but that adds to the washer fun :-D. Very subtle smell, and makes towels extremely absorbent.
Surf tabs:
Identical to Persil Non Bio tabs in terms of sudsing and rinsing, but has more fragrance. Also biological, which means are more effective on whites than it's Persil non-bio cousin.
Haven't tried Biological or Colour Care tabs yet.
Liquitabs:
Only perform OK. Not too bad, but then again not outstanding. Also very high sudsing, and sometimes still a thick layer of suds in the final rinse.
Persil Liquigel:
This has the classic smell of 1980's Persil and smells very nostalgic. However, very very very very!!!! susceptible to sudsing, even half the recommended dose caused the drum to fill entirely with suds and the overdosing light to flash at me, and it triggered 3 extra rinses!!! So I only use this with the more delicate cycles with the less vigorous tumbling.
Persil Silk & Wool:
Smells like shampoo in the bottle! Was very off put at using it at first but actually smells really nice on the end result. This is a high sudsing detergent at warm temperatures (30/40*C) to "cushion" woolies and the like, but is designed so that it doesnt suds in cold water, I guess for better rinsing results.
That's my basic review on all Unilever Persil (and Surf) products (I'm not sure if it all made sense, its half past midnight here and I'm not very with it). I'll post some pics of how different varieties suds/rinse out, as and when I use the different products, if that will be of any interest to anybody

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Take care all,
Jon