All these are liver toxic; so i wouldn't recommend combining them alltogether.
It's well known that var and winny are liver toxic.
Reference about clen being liver toxic:
http://www.bodybuilding.com/fun/catclen.htm
It says:
"Another thing people should be aware of is the inherent liver toxicity associated with clenbuterol use. When stacking with oral 17-alpha-alkylated steroids, accutane, anti-biotics or other hepatoxic elements, one should have his liver values checked by a licensed physician at regular points in time to avoid all problems. If you not a yellow discoloration of the skin cease use immediately and contact your doctor. "