Lemon and orange are the easiest scents to achieve from a chemistry standpoint. It probably complements the base smell of a product easier.
Fun fact A professor once told us that a molecule's chirality can make a diffeence. For example Limonene can either smell like pine or oranges depending on what way the molecule is mirrored.
It depends, a lot of the time, most cleaning products have that shitty "lemon" smell that fucking sucks, where it's obviously only masking a more unpleasant smell even if the unpleasant smell is just the actual cleaning product. That usually means it's even worse when there really is a foul odor present, cause then it smells like shit and lemon.
Limonene can either smell like pine or oranges depending on what way the molecule is mirrored.
Damn, that's interesting. My first thought on hearing that was wondering if pine scented cleaning products are a thing because it's cheaper to synthesize limonene in both chiralities and then separate after the fact than it is to just synthesize the orange-smelling version.
It doesn't really hold up to much scrutiny, but it would be pretty damn cool if that fact explained both OP's question, as well as explained pine-scented cleaning products!