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I've always cleaned my sensor myself.

I use two dry lens cleaning swabs. First, blow the sensor out with the blower. Then mist one sensor swab with lens cleaner. Use the misted swab to give the sensor a good clean. Then get the unmisted dry swab and keep wiping until you have removed all residue, leaving you with a mirror finish. Sometimes I have to do this process twice to get it perfect. Easy...

Notes: Check sensor to sun light as I find no other lighting picks up streaks as well.

I turn camera on to engage the IBIS and stop the sensor moving. Just don't touch the trigger, I've never been anywhere near close to doing so...

Get an actual lens cleaning solution. I use Kenssafe lens cleaning solution. I find that alcohol is extremely hard to get a streak free result, the proper lens cleaner makes a world of difference.

Sensors and lens elements are nowhere near as fragile as most people make them out to be. If you have even half a working brain it's pretty much impossible to damage them. Just use common sense, and new towels and swabs, and you can't go wrong.