Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
scour [ˈskauər] vt (search) обы́скивать (обыска́ть*perf) (clean) выска́бливать (вы́скоблить*perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.