...remove the skin oils, makeup and dirt. however, good skin cleansers can also do that.

How would the previous sentence be correctly capitalized?
Answer: ...remove the skin oils, makeup and dirt. However, good skin cleansers can also do that.
for adjustment of the handle to the work situation and body height, the handles can be individually adjusted from 210 to 390 cm in 26 cm steps.

How would the previous sentence be correctly capitalized?
Answer: For adjustment of the handle to the work situation and body height, the handles can be individually adjusted from 210 to 390 cm in 26 cm steps.
if your pc opens the macappl file, but it's the wrong application, you'll need to change your windows registry file association settings. in other words, windows is associating macappl file extensions with the wrong software program.

How would the previous sentence be correctly capitalized?
Answer: If your PC opens the MACAPPL file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating MACAPPL file extensions with the wrong software program.
it was a long and event-filled evening, with fun plays, reading of the christmas gospel, poems, and the customary walking around the christmas tree a norwegian tradition that is foreign, but new and exciting for many of the foreigners.

How would the previous sentence be correctly capitalized?
Answer: It was a long and event-filled evening, with fun plays, reading of the Christmas gospel, poems, and the customary walking around the Christmas tree a Norwegian tradition that is foreign, but new and exciting for many of the foreigners.