In this sentence, English might well keep the "the" as you're looking for a known tube of cream - so "I'm looking for the sunscreen, where have you (or did you) put it?"
"suntan lotion" rejected.
There is a difference between "suntan lotion" and "sunscreen"
We don't say sunscreen in UK we say suncream or sun lotion.
we say all sorts of things in UK sun lotion/cream, suntan lotion/cream, sunscreen....
Same thing in the US.
I say sunscreen, my friend says sun-block. They protect the skin from sun damage.
Suntan, sun lotion and cream offer less protection and permit tanning. In this country there is a big difference.