As far as algecide products, I never used them, and most experienced hobbyist don't reccomend them.They are a temporary fix that can have some side effects. The algea will return, unless the cause is sought out and eliminated. As far as hard to reach algea, I have a stiff toothbrush glued to the handle end of my algea scraper, ther are very few places I can't reach with it.
Excessive Algea growth is usually an indication of an imbalance of some type in the tank. If it's a planted tank I'd post in the plant forum for some help, If it's unplanted, there are several fairly easy and inexpensive cures.
First of all in unplanted tanks, I always kept my tank as stripped of nutrients as possible, Granted ammonia will still feed algea, but without other nutrients growth is much slower.
Secondly, light. Cut your light down to a bare minimum time each day, and use bulbs that will show your fish colors well, but aren't necessarily good plant bulbs. the less light the less algea growth.
As far as a cheap quick fix, black out the tank for a few days (3 minimum, I like 4-5) completely block all light. Trash bags or posterboard are good for this. don't feed your fish during the blackout. you can do a water change mid blackout if you like, but immediatly black the tank out again. at the end of a good blackout algea will be gone. But remember this is only a temporary fix (as are algea killing products) and you will still have to find out the cause and eliminate it. If this is a fish only tank, there will always be some algea, but it can be controlled to a large extent. I may be speaking a little out of turn, but the only totally algea free tanks I have seen are planted. My FO tanks used to get blacked out about once every two months, and then a little scraping in between was enough to maintain it and keep things looking good.
HTH
Dave