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The best one is supposed to be the single leg on a table one but I never had coffee tables in the shower (I know, how did I cope) and I'm a sucker for efficiency so I'd just touch my toes with a slight bend at the knees (dropped the soap, again?). At home I'd do a single leg sitting one because you can work each leg separately so you can adjust as needed. It helped my lower back pain a lot in the early days. I'm sure there's some physios doing examples on youtube.
hippy-
I couldn't figure out the single leg sitting one (janu sirsasana), but single leg on chair works a treat, as does bending over, and d-f-d (to an extent). Also find a seated version of a simple "pigeon pose" very good for the glutes/whatever those muscles that connect to the outside backside of the hip are called.
Sveinung
Which hamstring stretch do you rate?