ASM-1 flux cleaning problem

[Gur Milstein]

hi folks.
OK the things goes like that:
the ASM1 worked great before cleaning it,after
cleaning it all get mased up,lots of noise
on both VCA's,allso leaking of VCO's and LFO in to the VCA.
i clean it with a de flux spray only on the
solder side.clean it again and again but the same prob.
how can i know what  solder i use ?
may be it's a water based,i dont know.
i have litele black burnd flux on the joint's
but it is not brown.
the solder is made by MULTICORE SOLDERS LTD frome UK.

thanx
Gur Milstein