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Выдержки из "Relay Technical Information" от Panasonic/NAiS/Matsushita, раздел "SMT Soldering Guidelines": 

While surface mount relays are solvent washable, do not immerse the relay in cold cleaning solvent immediately after soldering.

When a soldering technique other than above is to be used (hot air, hotplate, laser, or pulse heater technique), carefully investigate the suitability of the technique.

Please use promptly once the antihumidity pack is opened (Signal relay: with in 3 days, Max. 30°C / 60%RH). If left with the pack open, the relay will absorb moisture which will cause thermal stress when reflow mounting and thus cause the case to expand. As a result, the seal may break.

Boiled cleaning is approved for surface mount relays. Ultrasonic cleaning may cause coil damage or light contact sticking.