There is no need to re-validate. The rationale for selection of limits established based upon the now discontinued product is still appropriate.  That the product is no longer manufactured is irrelevant, it's primary use was in calculation of the acceptable limits on the equipment and removing it from production should not force a re-validation of cleaning.

2015 Agalloco & Associates Training Schedule - Both courses in Princeton, NJ
October 19-21 - Sterilization: Principles & Validation
October 22-23 - Aseptic Processing: A Comprehensive Review
Details at