Like Natarajan said, the Nirma ad still rings in my ears-Washing powder Niram,dhoot si safedi...". It was very much catchy and was never boring even when heard it umpteen times in Radio. In the yesteryear ads, I liked that of Horlicks.
However I like the advertisement of one Agarbathi rand with words like ' Every one has many reasons to pray, .."
Another one I recall is the ad (seen in movie theatres shown before movie started and after interval) about a chocolate. Husband comes late forgetting his promise to wife for an outing dinner. She waits for him dressed up and just when she is going to blurt in anger he gives her a cadburys chocolate and she smiles. The tag line comes on the screen 'Sometimes, cadburys can say it better than words'.with voice over also.
Another catchy one was an advertisement for an adhesive with the lines ' we fix everything, except broken hearts'. I think no one can forget "Tandurusti ka raksha karta hai lifebuoy, lfebuoy hai jahaan tandurusti hai vahaan'
As Rao said, I also do not see TV programmes and hence do not see ads. Whenever ads come I change channel. In many of the ads which I happen to see also,, I do not get the proper relevance and connection to products. Most of them are extra noisy too.