The media has been full of the correct advice on cleaning for covid 19: that is SOAP and WATER and this is repeated over and over. There are lots of hand gels etc on the market that do have some convenience; at shop or business entrance etc and throughout hospitals. No one has claimed that chemical treatments are more effective than soap and water and in some cases, unless stated, it is warned that they may be less effective.
A damp cloth soaked in diluted washing up liquid is all that is needed and can be kept in the aeroplane together with a spray bottle just as simply as any gel or similar, and will do no damage.