Is there a drain cleaner liquid or powder which is environment friendly?

Yep, just do a search for environmentally friendly drain cleaners. There are sites that detail home made cleaners, like baking soda and vinegar, and commercially made products. I have never used any so I can't make a recommendation, but this should give you info that you need.

Hi Jeyeff

As Shader said, there certainly are environmentally friendly drain cleaners, but none of these work very well in the long-term (or the non-environmentally friendly ones either).

If you tell us exactly what fixtures you are having trouble with maybe we can make some suggestions that will be more helpful in the long run...

Let us know more, OK?

Mark