What’s the Best Cleaner for “No Clean” Solders and Pastes?

The number one cause of complaints about PCB cleaning are white residues on the board. These usually are salt crystals, residues of imperfect cleaning.

The number one cause of complaints about PCB cleaning are white residues on the board. These usually are salt crystals, residues of imperfect cleaning.

The No-Clean Flux Remover – VeriClean™ (#MCC-DC1) works great on “no clean” materials. However, a newer formulation from MicroCare — the VOC-Free Flux Remover – UltraClean™ (#MCC-VOC10A) — is an excellent choice and some users report the fast-drying, nonflammable General Purpose Flux Remover – Flux Remover C (#MCC-FRC) delivers good results as well.

The UltraClean™ products is a radically different cleaning formulation engineered exclusively by MicroCare. It is a highly effective circuit cleaner, offering superior results on “no-clean” fluxes and very good cleaning on rosin- and lead-free fluxes as well. This product also easily removes silicone conformal coatings and silicone glues. An excellent choice for defluxing circuit boards during rework and repair, this fast-drying fluid is the strongest cleaner on the market in its class (non-chlorinated, non-halogenated solvents).

VeriClean™ is another quick-drying cleaner with almost lower aroma than the UltraClean product; it’s widely used in areas where VOCs are a concern.

Lastly, the General Purpose Flux Remover C is an excellent choice. it is based on HFC solvents so it is nonflammable. It cleans great, is generally plastic safe, has a modest aroma, fast drying, and a very competitive price.

Special Note: If you are cleaning no-clean pastes from stencils or misprinted boards, the best choice is either the water-based Aqueous Stencil Cleaner (#MCC-BGA) or the solvent-based MultiTask™ Surface Cleaner Economy Wipes (#MCC-MLCW).