Dust inside camera housing

Hello,

I have gotten dust inside the camera housing (see picture), over the normal lens. It affects photos taken with colors not being as good as they should, and graining, especially in sunny conditions. I was thinking about following the IFIXIT back cover replacement guide (Reemplazo de la tapa trasera del Google Pixel 4a 5G) to get access to the cameras and replace the dust sealant from the inside thinking that the dust has come in between the frame and back cover. But i also read somewhere that the camera housing is a separate piece and that the dust may have come in from the gap between the back cover and camera house on the backside. And that it might be possible to just slightly lift the edge of the camera housing and blow out the dust. My question is if the back cover replacement guide is the bets bet to try and fix it or if there is a easier way.