The advice given by insurers to let electrical items dry out seems at best absurd, at worse Dangerous. Electricity and water does not mix and electrical items even if they do dry out, can at a later stage become unreliable as corrosion sets into the PCBs. Switches can stick, connections corrode with resistance and heat build up.
I would strongly suggest that the OP obtains the services of the approved service engineers for the particular items and ask them to carry out a technical examination of these items and obtain a report outlining their recommendation for repair or whether they are beyond economical replacement. Present these reports to insurers as part of the claim.