As a data point, I use a California Duster to dust the surfaces of my RV-12 -- no ACK ELT-04 issues in past three+ years.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 635+ hours (as of May 2018)!
through June 2018.