Zahara de Los Atunes, close to Cadiz, utilized tractors to splash more than 2km (1.2 miles) of seashore with a detergent arrangement daily before Spain permitted kids out of lockdown just because.
Tree huggers state the move caused "severe harm" to the neighborhood biological system.
Spain has been seriously influenced by the coronavirus, with 23,800 passings.
It as of late declared a four-stage intend to lift its severe lockdown measures and come back to "another typicality" before the finish of June.
María Dolores Iglesias, who heads a natural volunteer gathering in the Cadiz district, said she had visited the seashore at Zahara de Los Atunes and seen the harm for herself.
She said the sanitizer "executed everything on the ground, nothing is seen, not by any means creepy crawlies".
The seashore and its rises are ensured rearing and settling places for transient winged creatures and Ms. Iglesias said she had seen at any rate one home with eggs obliterated by the tractors.
"Fade is utilized as an exceptionally amazing disinfectant, it is sensible that it be utilized to sterilize lanes and black-top, yet here the harm has been ruthless," she revealed to Spanish media.
"They have crushed the hill spaces and conflicted with all the principles. It has been a distortion what they have done, likewise considering that the infection lives in individuals, not on the seashore. It is insane."
Ms. Iglesias said that given the lockdown, natural life had been flourishing with the seashore.
"The seashore has its specific manner of cleaning itself, it was a bit much," she said.
"They don't imagine this is a living environment, however a great deal of land."
Neighborhood official Agustín Conejo let it be known as "an off-base move".
"I concede that it was a misstep, it was finished with the best goal," he said.
Mr. Conejo said they had needed to ensure youngsters who were coming to see the ocean following a month and a half in control.
The Andalusian local government is currently considering fining the neighborhood expert for its activity, El Pais paper reports.
Greenpeace in Spain drew an examination with disputable proclamations by US President Donald Trump, who recommended that infusing patients with disinfectant may help treat coronavirus.
"Treating seashores in the reproducing season for feathered creatures or the advancement of the invertebrate system that will bolster beach front angling... isn't one of Trump's thoughts. It is going on in Zahara de Los Atunes," it tweeted.