this is by far the biggest issue fishing the north west, never found sss that good, catnip essence is powerfull but expensive, 100% deet works but carries health issues if used too frequently, picardine based works for me, and doesnt leave you greasy and stinking, i combine Shoo with neem oil, both harmless, the biggest issue is the length of time you get after putting it on, Shoo is very effective but needs applications every 10 mins or so, deet lasts longer but not as nice on,
ultimately you really need a head net and expose no skin, and applying repellant before exposure.