It’s very easy to clean filter of split AC. Mine is hitachi, however process is same for most of split ACs. Following are the steps.
1 locate the space to open front cover of indoor unit.
2 open front cover.
3 gently remove filters.
4 clean filters in running water. You may use detergent.
5 shadow dry filters.
6 refix filters on their place.
7 close front cover.
1 remove electric plug first.
2 do not apply force to open/close anything.
3 no screw nut or bolt is needed to open.
4 pay attention to all the warnings written on unit.