Beaches in Devon and Dorset where hundreds of birds were washed up are stll be scoured.
Experts are looking out for any more Guillimots and razorbills crippled by the still unidentified sticky substance. They were found from the Isle of Wight to Cornwall, but most were found at Chesil Beach in Dorset.
A number of birds have been found dead on Dorset's coast as the rescue operation continues.
The sea birds are covered in a mysterious substance. More than a hundred have been rescued and taken to the RSPCA centre in West Hatch where margarine and washing up liquid are being used to clean them.
RSPCA deputy chief inspector John Pollock says: "The numbers of the birds coming in have been growing and sadly there were quite a few dead birds this morning. We are still down at the beach, though, collecting and trying to save as many of them as we can."
The RSPCA has been called to the rescue of more than 100 sea birds being found covered in an unidentified sticky substance.
The guillemots have been found along the Dorset/Devon coast from Weymouth to Torquay covered in the greasy film, many have very sore legs.
They are mainly being found on the near Portland,West Dorset.
The birds are being taken to RSPCA West Hatch Wildlife Centre in Somerset where efforts to clean them are being made with the usual techniques. It is too early to know whether this has been successful, but the early signs are that they are not responding well.