... share increased, One-to-one service Twin tank ultrasonic cleaning machineCleaning methodProfessional ultrasonic cleaning is recommended ... the years, dirt, dust, grime, nicotine, smoke, and pet odors can contaminate your window coverings. ... frequency42khzThe number of vibrator96 up to 100pcsCharactertwin Tank SystemSolid Stainless Steel Constructiondigital TimerSweep FrequencyLocking CastorsValve ...